Final answer:
In sentence 1, the correct capitalization is: Dashiell visited his cousin Elaine on Tuesday. In sentence 2, the correct capitalization is: Juniper sent a card to her uncle Archibald who has been unwell.
Step-by-step explanation:
In sentence 1, the correct capitalization is: Dashiell visited his cousin Elaine on Tuesday. Only proper nouns and the first word of a sentence should be capitalized. In sentence 2, the correct capitalization is: Juniper sent a card to her uncle Archibald who has been unwell. Again, only proper nouns and the first word of a sentence should be capitalized.